From: Mark Thom <markjordanthom@gmail.com>
Date: Sun, 12 Apr 2020 03:52:45 +0000 (-0600)
Subject: do not accept [X|Xs] patterns as DCG non-terminals (#286)
X-Git-Tag: v0.8.119~19
X-Git-Url: https://git.sagredo.dev/?a=commitdiff_plain;h=92d86421332b7d1fed92e748f887103599f7ca8b;p=scryer-prolog.git

do not accept [X|Xs] patterns as DCG non-terminals (#286)
---

diff --git a/src/prolog/lib/dcgs.pl b/src/prolog/lib/dcgs.pl
index e8e18844..bd35575d 100644
--- a/src/prolog/lib/dcgs.pl
+++ b/src/prolog/lib/dcgs.pl
@@ -107,7 +107,8 @@ dcg_constr((_->_)). % 7.14.12 - if-then (existence implementation dep.)
 % The principal functor of the first argument indicates
 % the construct to be expanded.
 dcg_cbody([], S0, S, S0 = S).
-dcg_cbody([T|Ts], S0, S, lists:append([T|Ts], S, S0)).
+dcg_cbody([T|Ts], S0, S, Goal) :-
+    dcg_terminals([T|Ts], S0, S, Goal).
 dcg_cbody(( GRFirst, GRSecond ), S0, S, ( First, Second )) :-
     dcg_body(GRFirst, S0, S1, First),
     dcg_body(GRSecond, S1, S, Second).